640510132 has 12 divisors (see below), whose sum is σ = 1131369120. Its totient is φ = 317261816.

The previous prime is 640510111. The next prime is 640510259. The reversal of 640510132 is 231015046.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 747832 + ... + 748687.

It is an arithmetic number, because the mean of its divisors is an integer number (94280760).

Almost surely, 2^640510132 is an apocalyptic number.

It is an amenable number.

640510132 is a deficient number, since it is larger than the sum of its proper divisors (490858988).

640510132 is a wasteful number, since it uses less digits than its factorization.

640510132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1496630 (or 1496628 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 640510132 is about 25308.3016419514. The cubic root of 640510132 is about 862.0027831371.

Adding to 640510132 its reverse (231015046), we get a palindrome (871525178).

The spelling of 640510132 in words is "six hundred forty million, five hundred ten thousand, one hundred thirty-two".